After we've selected View Page Source on a web document, the active Zoom value will no longer be applied to subsequent web documents in that pane. The Zoom we selected, say 125%, remains checked, and remains active for Scrivener's native editable documents. But once we've run a View Page Source in the pane, web documents will display at 100%, rather than the 125% shown under View > Zoom, until we use that command to reestablish our preferred value.